BT Cloud Voice SIP has failover by DDI/extension as standard. This means each extension can be set up to forward to an alternative number, or an emergency message. Individual DDIs, or a selection of DDIs, such as a department, can be diverted separately.
BT Cloud Voice SIP supports failover to a standby circuit. If your business operates from a single site or campus, you can configure the switch to failover automatically.
We don't support load balancing on SIP.
Learn more with the BT Business Community: What is BT Cloud Voice SIP?